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Jemima Khan arrives at the City of Westminster Magistrates Court for Assange's hearing.

As WikiLeaks founder Julian Assange continues his fight against extradition in a London court, several high-profile benefactors have stepped in with offers to pay surety on his £200,000 ($378,000) bail. Some, like Fahrenheit 9/11 filmmaker Michael Moore and director Ken Loach, are well-known social and political activists.

One of Assange's most vocal financial backers is better known as the wealthy scion of one of Britain's most famous banking dynasties -- although she herself might be annoyed with that characterization.

Jemima Khan is the 36-year-old daughter of late financier Sir James Goldsmith, who was a headline fixture with a colorful personal life. Her family doesn't make the cut on Forbes' World's Billionaires list, but they are very rich: the UK's Sunday Times Rich List pegs them at £300m (about $475 million). Khan is a household name in the UK, not just as "a Goldsmith" but as the ex-wife of cricket star Imran Khan, the one-time girlfriend of rom-com regular Hugh Grant, the sister of a young Member of Parliament and a staple of the London charity dinners circuit.

Khan offered to provide a £20,000 ($31,500) surety, or financial guarantee, for Assange's bail -- first anonymously, and then publicly at the urging of the WikiLeaks founder's lawyer, who thought it would help if she attended his court hearings (she did, and tweeted about it).

Today, after attending Assange's bail hearing, Khan took to Twitter again to bemoan headlines in the UK press describing her as a "socialite". "Calling me 'a socialite' is such a lazy way for journalists to undermine me and the Assange defence," she wrote, following up with another tweet: "NB- I rarely go out, I write, have worked for charities my entire adult life and I campaign on issues that I believe in."